What device converts electrical energy into mechanical energy and can be driven by AC or DC?

What device converts electrical energy into mechanical energy and can be driven by AC or DC?

• A. Electric Motor
• B. Generator
• C. Transformer
• D. Solenoid

Answer: (A)

Electric motors take electrical energy and turn it into mechanical energy. The moving force comes from magnetic interactions: current flowing in windings inside a magnetic field creates a force that produces torque on the rotor. When powered by direct current, the motor uses a commutator (or electronics) to keep the torque in the same rotational direction, giving continuous rotation. When powered by alternating current, the stator creates a rotating magnetic field and the rotor follows it, again producing rotation. This ability to run on either AC or DC makes the motor the correct device here. Generators do the opposite (convert mechanical to electrical energy), transformers transfer electrical energy without producing motion, and solenoids convert electricity to linear motion but aren’t the general rotating motor used to produce mechanical work.

Electric motors take electrical energy and turn it into mechanical energy. The moving force comes from magnetic interactions: current flowing in windings inside a magnetic field creates a force that produces torque on the rotor. When powered by direct current, the motor uses a commutator (or electronics) to keep the torque in the same rotational direction, giving continuous rotation. When powered by alternating current, the stator creates a rotating magnetic field and the rotor follows it, again producing rotation. This ability to run on either AC or DC makes the motor the correct device here. Generators do the opposite (convert mechanical to electrical energy), transformers transfer electrical energy without producing motion, and solenoids convert electricity to linear motion but aren’t the general rotating motor used to produce mechanical work.